Primary human epidermal keratinocytes isolated from adult skin, cryopreserved at the end of the primary culture. • Viability at least 70% • ≥500,000 viable cells/vial • Capable of at least 25 population doublings • Mycoplasma: Not Detected • Hepatitis B: Not Detected • Hepatitis C: Not Detected • HIV-1: Not Detected • Bacteria, yeast, and other fungi: Not Detected